Sectional screw conveyer.



No. 643,636. Patented Feb. 20, I900.

A. c. ELMER.

SEGT IONAL SCREW GONVEYEB.

(Application filed July 14, 1899.)

(No Model.)

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Attorneys.

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ALBERT C. ELMER, OF DETROIT, MICHIGAN.

SECTIONAL SQREW CONVEYER.

SPECIFICATION forming part of Letters Patent No. 643,636, dated February 20, 1900.

Application filed July 14, 1899.

To all whom it may concern:

Be it known that I, ALBERT O. ELMER, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Sectional Screw Conveyers; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to conveyors, and has for its object an improved form of conveyerblade which can be made of cast-iron and of which a number can be assembled around a common shaft to produce a complete conveyer.

In this kind of apparatus the screw-blade is subjected to considerable wear upon its driving-face. If the blades are made of cast-iron, the driving-face may be chilled, so as to resist the abrading action incident to its use. I therefore provide that there shall be but few bolts, so that their cross-section shall be as great as possible relative to the weakening of the hub by the bolt-holes, that the main bolt-holes shall be located at points remote from corners or edges in the casting, where weakening by crystallization may occur, and

I so form the sections that each shall be a support to the other when in place upon the shaft.

In the drawings, Figure 1 shows in elevation a complete casting which constitutes onehalf of 'a turn of a spiral conveyer. Fig. 2 shows a number of castings assembled together in the position they take around a driving-shaft. Fig. 3 shows a complete conveyer.

In Fig. 2 the driving-shaft which supports the conveyer is not shown.

Each turn of the conveyer is composed of two castings of the form shown in Fig. 1, and each casting consists of a hub part A and a wing part or thread part B. The hub part A is the one-half of a tube, of which the ends are bounded by spiral lines a and b and the sides are bounded by straight'lines c and d. A thread or screw-blade B is cast integral with serial No. 723,797. (No model.)

the hub part A. The upper surface of the hub A changes gradually into the surface of the thread or screw-blade B, so as to present a curved bounding-line, as indicated by the shading in Figs. 2 and 3. By-this means the junction of the blade and hub is made much stronger. On one end of the thread B is a projecting lug 6, through which there is a bolthole 6. The lug e is cast in the under or following side of the screw-thread B and projects beyond the end line f of this section of the screw-thread. Through the end f of this section of the screw-thread is a bolt-hole e Through the hub A of the section at its center is a bolt-hole a. All of the sections of the completed conveyer are alike, and the sections follow one another or are strung along a shaft F, to which they are bolted by bolts that pass through the holes a and through the shaft F. The contiguous sections of the spiral, with theirlong straight edges 0 d in contact, so that a section can neither slide nor twist upon the shaft without causing a corresponding motion in the adjacent section, may be interrupted at any place where it is desired to sup port the shaft between the end supports of the shaft, and consequently the conveyor may be built up of indefinite length, and in case of the breakage of any one of the sections that section may be removed anda new section substituted for it without disarranging any other section or stripping any part of the shaft, as it is only necessary to remove the two bolts by which the section is bolted to its two adjacent sections and the one bolt that passes through the shaft, remove the broken section, substitute a new one, and replace the bolts.

Each section is so shaped that it can be easily and readily cast without spiral cores or other special appliances, and consequently a conveyer made from sections embodying this invention is easily and cheaply constructed in the first instance,is easily and cheaply assembled, and is easily and cheaply repaired in case of breakage.

What I claim is- As a new article of manufacture, a cast-iron section for a screw conveyelycomprisin g a hub portion of half-tubular form havingabolt-hole In testimony whereof I sign this specificanear the center thereof, said hub having edges tion in the presence of two witnesses.

c 01 adapted to en a e with correspondin edges of adjacent se ti nmsubstantially as d; ALBERT ELMER' scribed,and a spiral wing along one of its ends, Witnesses substantially as shown and for the purpose set 1 ANDREW II. GREEN, J12,

forth. O. G. HERBERT. 

